Calendar High Sierra Issue

Hello,

I recently upgraded my macs (MacBook Pro, iMac & MacPro) to High Sierra. On Calendar, I've lost the ability to accept an invite to the appropriate calendar. On previous incarnations of osX, I had the ability to choose which calendar an invite went to, via a drop-down that would appear when clicking/holding accept in the popup (pop down?) that appeared when clicking on the button (in Calendars top header/border) showing x# of invites in my mailbox. I would have then be able to choose from any of calendars (all associated with my domain / google apps calendar)... whether it was my work calendar, family calendar or my son's activities calendar, etc.

After the upgrade, I'm only being given the option of accepting invites into my work calendar (no others appear) which is a drag as this calendar is shared with others. Is there a way to correct this?

Thanks!